Abstract
The effect of the patterning of a Ga1−xMnxAs (x=0.08) film into an array of microscopic dots on its magnetic properties is locally studied by means of scanning Hall probe microscopy. The measured stray field patterns indicate the presence of a single domain state with a uniform magnetization within the Ga1−xMnxAs dots. The magnetic anisotropy of the dot array is directly imaged, revealing a [100] easy axis in the as-grown sample and a [11¯0] easy axis orientation after annealing. In contrast to a temperature dependent anisotropy in the plain Ga1−xMnxAs film, no magnetic easy axis reorientation is observed within the experimentally accessible temperature range.
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